diff --git a/src/main/java/org/codelibs/fess/app/web/base/FessSearchAction.java b/src/main/java/org/codelibs/fess/app/web/base/FessSearchAction.java
index 1cb349604..ddc1b1364 100644
--- a/src/main/java/org/codelibs/fess/app/web/base/FessSearchAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/base/FessSearchAction.java
@@ -104,7 +104,6 @@ public abstract class FessSearchAction extends FessBaseAction {
     protected void setupHtmlData(final ActionRuntime runtime) {
         super.setupHtmlData(runtime);
         runtime.registerData("osddLink", openSearchHelper.hasOpenSearchFile());
-        runtime.registerData("helpPage", viewHelper.getPagePath("common/help"));
 
         final List<Map<String, String>> labelTypeItems = labelTypeHelper.getLabelTypeItemList();
         runtime.registerData("labelTypeItems", labelTypeItems);
diff --git a/src/main/java/org/codelibs/fess/app/web/help/HelpAction.java b/src/main/java/org/codelibs/fess/app/web/help/HelpAction.java
index 2ea8e559b..b8239e84f 100644
--- a/src/main/java/org/codelibs/fess/app/web/help/HelpAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/help/HelpAction.java
@@ -46,6 +46,7 @@ public class HelpAction extends FessSearchAction {
             });
         }).renderWith(data -> {
             buildInitParams();
+            data.register("helpPage", viewHelper.getPagePath("common/help"));
         });
     }
 
diff --git a/src/main/java/org/codelibs/fess/app/web/osdd/OsddAction.java b/src/main/java/org/codelibs/fess/app/web/osdd/OsddAction.java
index 03baefca2..7866aa8f0 100644
--- a/src/main/java/org/codelibs/fess/app/web/osdd/OsddAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/osdd/OsddAction.java
@@ -17,8 +17,7 @@ package org.codelibs.fess.app.web.osdd;
 
 import org.codelibs.fess.app.web.base.FessSearchAction;
 import org.lastaflute.web.Execute;
-import org.lastaflute.web.response.HtmlResponse;
-import org.lastaflute.web.util.LaResponseUtil;
+import org.lastaflute.web.response.StreamResponse;
 
 public class OsddAction extends FessSearchAction {
 
@@ -39,10 +38,9 @@ public class OsddAction extends FessSearchAction {
     //                                                                      ==============
 
     @Execute
-    public HtmlResponse index() {
+    public StreamResponse index() {
         searchAvailable();
-        openSearchHelper.write(LaResponseUtil.getResponse());
-        return null;
+        return openSearchHelper.asStream();
     }
 
 }
\ No newline at end of file
diff --git a/src/main/java/org/codelibs/fess/helper/OpenSearchHelper.java b/src/main/java/org/codelibs/fess/helper/OpenSearchHelper.java
index c7fdf6840..0356f081d 100644
--- a/src/main/java/org/codelibs/fess/helper/OpenSearchHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/OpenSearchHelper.java
@@ -16,17 +16,15 @@
 package org.codelibs.fess.helper;
 
 import java.io.File;
-import java.io.IOException;
+import java.io.FileInputStream;
+import java.io.InputStream;
 
 import javax.annotation.PostConstruct;
-import javax.servlet.ServletOutputStream;
-import javax.servlet.http.HttpServletResponse;
 
-import org.apache.commons.io.IOUtils;
-import org.codelibs.core.io.FileUtil;
 import org.codelibs.core.lang.StringUtil;
 import org.codelibs.fess.Constants;
-import org.codelibs.fess.exception.FessSystemException;
+import org.lastaflute.web.exception.ForcedRequest404NotFoundException;
+import org.lastaflute.web.response.StreamResponse;
 import org.lastaflute.web.util.LaServletContextUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -67,21 +65,15 @@ public class OpenSearchHelper {
         return osddFile != null;
     }
 
-    public void write(final HttpServletResponse response) {
+    public StreamResponse asStream() {
         if (osddFile == null) {
-            throw new FessSystemException("Unsupported OpenSearch response.");
-        }
-
-        response.setContentType(contentType + "; charset=" + encoding);
-        ServletOutputStream os = null;
-        try {
-            os = response.getOutputStream();
-            os.write(FileUtil.readBytes(osddFile));
-        } catch (final IOException e) {
-            throw new FessSystemException("Failed to write OpenSearch response.", e);
-        } finally {
-            IOUtils.closeQuietly(os);
+            throw new ForcedRequest404NotFoundException("Unsupported OpenSearch response.");
         }
 
+        return new StreamResponse(osddFile.getName()).contentType(contentType + "; charset=" + encoding).stream(out -> {
+            try (InputStream ins = new FileInputStream(osddFile)) {
+                out.write(ins);
+            }
+        });
     }
 }
diff --git a/src/main/webapp/WEB-INF/view/common/help.jsp b/src/main/webapp/WEB-INF/view/common/help.jsp
index 81c9a8a0d..867d7337f 100755
--- a/src/main/webapp/WEB-INF/view/common/help.jsp
+++ b/src/main/webapp/WEB-INF/view/common/help.jsp
@@ -72,7 +72,7 @@
 <dl>
 	<dt>Add To Browser Search Engines</dt>
 	<dd>
-		Click <a href="#" onclick='window.external.AddSearchProvider("http://localhost:8080/fess/osdd");return false;'>here</a>
+		Click <a href="#" onclick='window.external.AddSearchProvider("/osdd/");return false;'>here</a>
 		 to add a search engine list for your browser.
 	</dd>
 </dl>
diff --git a/src/main/webapp/WEB-INF/view/common/help_ja.jsp b/src/main/webapp/WEB-INF/view/common/help_ja.jsp
index f487828b7..6420aecaa 100755
--- a/src/main/webapp/WEB-INF/view/common/help_ja.jsp
+++ b/src/main/webapp/WEB-INF/view/common/help_ja.jsp
@@ -70,7 +70,7 @@
 	<dt>ブラウザの検索エンジンに追加</dt>
 	<dd>
 		ご利用のブラウザの検索エンジン一覧に追加するためには
-		<a href="#" onclick='window.external.AddSearchProvider("http://localhost:8080/fess/osdd");return false;'>ここ</a>をクリックしてください。
+		<a href="#" onclick='window.external.AddSearchProvider("/osdd/");return false;'>ここ</a>をクリックしてください。
 	</dd>
 </dl>